Some steel structures are not ultimately seen on a construction site. Project Stinger & A-Frames is a great example of that.
For Ocean Offshore and via Johan de Visser of De Visser Constructie, Dijkstaal B.V. was commissioned to produce a special steel structure. It involved a system that allows a heavy cable to be lowered from a ship to great depths, while safely guiding divers underwater.
In our factory in Maassluis, we produced five main components: two A-frames, two hinged arms and one large stinger. Together, these accounted for nearly 7,000 kg of structural steel in S355J2.
The backbone of the structure consists of HEB 200 and HEB 140 beams. For the railing on the stinger, almost 47 metres of round tube were processed. This railing was reinforced with angle steel diagonals and fitted with two precisely fabricated cable guides on the corners.
The black A-frames with solid hinge discs were welded to the ship’s deck. The yellow stinger can be raised and lowered. In use, the system may seem simple, but the execution required technical custom work, precise welding and careful coordination between all components.
The transport also required a different approach. The structure was not transported by road, but by water: via the outer harbour of Maassluis towards the Waalhaven. There, the customer took care of the protective coating.
A great job with a tight schedule, technical custom work and craftsmanship from our people. We look back with pride on this special project on the water.
View our project video here
